Facebook may be the most popular social network by a mile with Twitter trailing. While Facebook won't be usurped any time soon from its top spot, the competition for second place is heating up.

According to a study conducted by the Pew Research Center, Pinterest is nipping at the heels of Twitter. The study reveals that about 67 percent of people in America are on Facebook, 16 percent are on Twitter and an estimated 15 percent use Pinterest.

For huge events like the Super Bowl, Twitter was the venue for users to express their happiness and vent their frustration. But even with that popularity, Facebook still reigns supreme.

Just last August 2012, an estimated 12 percent of users were on Pinterest -- indicating substantial growth according to the most recent study.

While still in third place, there has already been talk of Pinterest possibly becoming the most popular social network.

"According to statistics released by ComScore in February 2012, Pinterest has more than 10 million monthly unique visitors and is now the third most popular social networking site behind Facebook and Twitter.

"With these staggering numbers, it looks like Pinterest could be on track to become the next social media giant," Forbes reported.

Landing in fourth place was popular photo social network Instagram.

Pinterest users

Pinterest, the online pinboard, has attracted 15% of internet users to its virtual scrapbooking. Whites, young
people, the well-educated, those with higher income, and women are particularly likely to use the site. Pinterest
is equally popular among those 18-29 and 30-49 (19%). Women are about five times as likely to be on the site as
men, the largest difference in gender of any site featured in Pew's research report.